Drill



Aug. 16, 1932. 1.. M. PEARCE ET AL DRILL gwuemtw 2m Original Filed April 14, 1951 Patented Aug. 16, 1932 warren STATES PATENT or-Flee;

LOUIS M. PEARCE AND WALTER LL causes, or nous'ron 'rnx zis g,

DRILL,

Original application filed April 14, 1931, Serial .No. 529,930. Divided and this application filed April 9,

1932. Serial This invention relates to a drill.

An object of the invention is to provide a drill having a head and a detachable blade or cutter, secured to the head in a novel mannor. Another object of the invention is to provide novel means for securing the blade or other cutting member in the head whereby the play of said cutting member in the head due to wear or otherwise, may be taken up so that said cutting member may besecured and readily maintained immovably in the head.

The subject matter of this application has been divided out of our joint pending application for drill filed April 14, 1931 under Serial No. 529,930.

WVith the above and other objects in view, this invention has particular relation to certain novel features of construction, arrangement of parts and use, an example of which is given in this specification and illustrated in the accompanying drawing, wherein:

Figure 1 shows a side view of the drill.

Figure 2 shows a transverse sectional view taken on the line 22 of Figure l, and

Figure 3 shows a fragmentary vertical sectional view thereof.

Referring now more particularly to the drawing, wherein like numerals of reference designate similar parts in each of the figures the numeral 1 designates the head whose upper end may be threaded for attachment of a drill collar or drill stem thereto. The head may be of any desired contour or length and has a transverse mortise 2 across the lower end thereof separating the said end into the prongs 3, 3. A suitable cutting or abrading member 4 is provided whose lower end may have any selected type of boring members, the cutting blades 5, 5 being shown which have cutting edges forwardly curved in opposite directions. The upper end of the member 4: is fitted into the mortise 2.

There are the bolts 6, 6, which are fitted through the prongs 3, 3 from opposite sides and these bolts are threaded through the cut ting member 1. The bolts have the enlarged heads 7 which are countersunk into corresponding recesses 8, 8 in the prongs 3 and the 50 outer ends of said heads 8 are approximately flush with the outer sides of said prongs. The free ends of the bolts 6 are reduced and threaded to receive the nuts 9, 9 which are countersunk into the sockets 10, 10 of the corresponding prongs.

In case the cutting member 4 should become loose from wear or other cause the bolts 6 may be tightened up to draw said member. closely against the adjacent prong 3 to take up the play. 7 V

The head has an axial water course 11 and the boring member 4 has the side channels 12, 12 through which a flushing fluid .may be delivered from the course 11 on to the forward sides of the blades.

The bolts 6 are made relatively large so that they are not liableto break and have threaded connections with the cutting member 4 so that should the reduced ends of said bolts become broken ofi the cutting member 4 will still be held in the head against dropping into the bore. 1

The drawing and description disclose what is now considered to be a preferred form ofthe invention by way of illustration only while the broad principle of theinvention will be defined by the appended claims.

What we claim is:

1. A drill comprising a head having a transverse mortise, a boring member inserted into said mortise, a bolt through said head and boring member and having a threaded connection with said boring member.

2. A drill comprising a head having a transverse mortise, a boring member inserted into said mortise, abolt through said head and boring member, having an external abutment operative against the head said bolt having athreaded connection with the boring member. 90

3. A drill comprising a head having a transverse mortise, a boring member inserted into said mortise, bolts through said head and boring member, having external abutments on one end operative against opposite 95 sides of the head said bolts having threaded connections with the boring member each bolt having nuts screwed onto the other ends of said bolts.

4. A drill comprising a head, a

boring member at the lower end thereof, said head and boring member being provided, one with a transverse mortise forming prongs and the other being shaped with a tenon fitted between said prongs, bolts fitted through said prongs and tenon from opposite sides of the drill and having threaded connections with the tenon. Y 7

In-testimony whereof we have signed our names to this specification.

LOUIS M. PEARCE. WALTER L. CHURCH. 7 

